Figure:
A researcher was interested in the effects of arousal and personality on individuals' GRE test performance.The personality variable he examined was individuals' level of introversion-extraversion.Based on questionnaire responses,each participant was classified as an "extravert" or an "introvert." The researcher manipulated arousal level by giving caffeine to participants prior to administering a practice GRE test.Participants were randomly assigned to a high-caffeine condition,a medium-caffeine condition,or the no-caffeine conditions.All participants then completed a practice version of the quantitative portion of the GRE.
Suppose the researcher observed the following means for each group: 
-These results would most likely indicate a statistically significant
A) interaction effect between arousal level and personality.
B) main effect of personality.
C) main effect of arousal level.
D) none of these
Correct Answer:
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A researcher was interested in the effects
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A researcher was interested in the effects
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